rpcbind allowed port range on linux

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Hi list,

my problem is, rpcbind gave a tcp port to nlockmgr where I assumed
this port is reserved.

Now, I didn't find the spec that says which ports rpcbind is allowed
to use, but I thought it is the ephemeral ports, on linux defined with
the range in kernel configuration net.ipv4.ip_local_reserved_ports
minus exclusions from net.ipv4.ip_local_reserved_ports.

So, my questions are
1) Is my assumption about allowed ports correct?
2) If not: how can I define that range?
3) If yes: was there a fix for that since my rather old SLES 12
version rpcbind-0.2.1_rc4 (kernel 3.12.55)? I didn't find something
obvious to me in the changelog.

Bonus question: would it have been safe/possible to free up the port,
e.g. with rpcbind -d? I only found out about that option after a
reboot...

BR,
Joachim

(please keep me in cc)
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